In Hinduism, the ritualistic prayers and purification practices performed at dawn (morning) or dusk (evening), considered sacred transition times.
From Sanskrit 'sandhyā' meaning 'junction' or 'meeting point.' The word combines 'sam' (together) and 'dhyā' (meditation), reflecting the twilight as a meeting point between night and day, darkness and light.
Sandhya times—dawn and dusk—are scientifically special because your brain's circadian rhythm is most sensitive to light changes then, which is probably why so many religions worldwide (Christian monks, Islamic Fajr prayer, Jewish dawn prayers) chose these exact moments for spiritual practice.
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